Magnetic chuck and casing.



A. M.-DRAKE.

MAGNETIC CHUCK AND CASING. APPLICATlON FILED SEPT.26 x9 6.

1,213,167. ,Patented Jan. 23,1917.

M62771 Era/ e) UNITED sT TEs PATENT OFFICE- ALDEN M. DRAKE, OF WORCESTER, MASSACHUSETTS, ASSIGNOB TO HEALD MACHINE COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

MAGNETIC CHUCK AND casino.

Specification of Letters Patent.

Patented J an. 23. 191 7.

Application filed September 26, 1916. Serial No. 122,304.

To all whom it may concern Be it known that I, ALDEN M. DRAKE, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Magnetic Chuck and Casing, of

which the following is a specification.

This invention relates to a magnetic chuck and to a casing therefor adapted to exclude water 'and cutting compounds from a the interior of thechuck body. Soda water and cutting compounds are used in arge quantities in grinding operations and not infrequently find their way into the interior of the magnetic chucks, wheregithey cause serious damage by short-circuiting the coils and destroying the insulation.

It is the object of my invention to provide 1 .an improved combination-offmagnetic chuck and easing by the use of which all fluids may be effectively excluded while at the same time the construction is simplified and 1 low cost of manufacture is attained.

With this'object in view an important feature of my'invention'relates to the provision of an outwardly projecting flange on the cover plate of the chuck to which a casing may be securely clamped, with surface errgagement between the flange and the casing.

In thepreferred form I also provide a bandengaging the opposite face or surface of the flange and-I provide means for drawing the casing and band together thereby securing a' tight bearing at all points of the circumference. on both parallelsurfaces of the flange.

My invention further relates to certain'ar- Y range ments and combinations of parts which.

will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of my invention shown in thedrawing which is a vertical sectional view of a magnetic chuck and casing embodying my invention.' The chuck, as shown in, the draw ng; is formed in two parts, a body portion 10;and a top or cover plate 11,.these parts being secured together by suitable screws 12. This type of chuck is V frequentlymounted upon the upper end of a spindle13j rotatable in a bearing 14:. Suit- T able provision, not 'shown,'is' made for rotat- 111g the"cl 1uck,'- and acasing 15 is secured thereto to exludecutting compounds or other fluids fronf'tlieinterior r the body 10.-

Upwardly-extending circular flanges 16 and '17 may be formed integral with the bearing 14: and positioned adjacent the casing 15 on the inner and" outer sides thereof respec-' tively. With thisconstruction .it will be seen that it is impossible for fluids to reach the mterior of the chuck except by passing through the joint between the casing 15 and the chuck. In orderto prevent any leakage at this point I provide an annular flange 20 upon the outer edge of the cover plate 11. As shown in the drawings this flange is formed at the loweredge of the plate, and in any" event it shouldbje located at a substantial distance below the working surface of the chuck.- The parallel surfaces of this flange are carefully finished and the inwardly extending portion 15 of the casing 15 is also machined to form a close fit upon the flange 20. It is particularly important that the casing 15 closely engage the upper surface ofthe flange 20, and in the preferred form the casing also fits closely against thecurved edge of the cover plate 11, and against the curved edge of the flange 20. A ring or band 21 is fitted under the flange 20, and is provided with a number of tapped holes adaptedto receive binding screws 22 which extend down throughthe portion 15" of the casing 15. By turning these screws the band 21 and the portion 15 maybe drawn tightly against the opposite fsides of the flange 20, thus forming a close fitting joint Qwhic'h e'fiectually excludes moisture and fluids from the interior. of the body 10. j

This construction; though simple in its details, has been found peculiarly efiiective for flange projecting outwardly therefrom at a point below the upper surface thereof; and

said casing compris ng a cover member encirclingsaid top '.pl.ate and engaging; said flange and having r depending outer portion, and means to clamp said member firmly against said flange, whereby a tight joint is formed.

2. In combination, a magnetic chuck and a casing therefor, said chuck having a top plate with a flange belowdts upper surface, andsaid casing comprising a cover member having an inwardly projecting portion fitting the upper surface of said flange, a band engaging the lower surface of said flange, and means to draw said cover member and hand firmly against the parallel faces of said flange, forming close contact therewith;

3. In combination, a circular magnetic ALDEN M. DRAKE. 

